Got some cool work here! I love that sketchbook page (the collagey one in pen) -- very fun to look at.

The colors in that alla prima in the most recent post, and from that boy's turnaround headshot a bit back are really beautiful, too. The palettes really work.
It's good to see you're drawing a wide variety of subjects (figures, landscapes and vehicles) and in a variety of mediums (digital, paint, charcoal), but like you mentioned, gotta work on those foundations. You're pretty well-rounded so where you wanna focus is up to you.. anatomy and light/value stand out to me. Do work from life, not just photos and your head! Maybe do some of the good-old fashioned still lifes, with a focus on the shading (black and white maybe)? Figure drawing from life too.
Again, you've got some great stuff starting here.

But don't neglect technical skills!
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